Yesterday I released my app 'Pic Words' to the windows phone store. It is an Silverlight/XNA app that runs on Windows Phone 7.1 & 8. I have BugSense incorporated into my app. Today I started receiving a lot of crash reports emanating exclusively from the 8.0.10211.0 version of Windows Phone 8. I could not replicate the issue since I do now currently own a Windows 8 phone and the emulator is running OS version 8.0.9903.0, which I don't think can be changed. The error from BugSense is as follows:

XNA Framework Reach profile does not support separate alpha blend. BlendState.ColorDestinationBlend and AlphaDestinationBlend must be set to the same value.

I can't tell you the exact issue, but I'm 99% sure it originates in your BlendState.AlphaBlend. Looks like something is going wrong on the older version of WP8. What you could do is do a readout of all the members on a working demo, like your emulator, then create a custom BlendState with the exact same settings and use that in place of BlendState.AlphaBlend.
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William 'MindWorX' MariagerJul 17 '13 at 3:39

In an attempt to resolve this as fast as possible, I've attached an answer. I hope it solves your problems.
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William 'MindWorX' MariagerJul 17 '13 at 3:49

I just found out i have a phone with that exact os version. I might be able to help you out with a bit of testing.
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William 'MindWorX' MariagerJul 17 '13 at 4:02

This way you avoid using the built-in one that seems to have issues, and instead you use one that has been tailored to work. This is definitely a workaround but unless you want to force your players to update, it's the only solution.